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Discovery and designation
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| Discovered by | E. W. Elst |
| Discovery site | European Southern Observatory |
| Discovery date | August 16, 1990 |
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Designations
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| MPC designation | 8657 |
| Named after | Cedrus |
| Alternate name(s) | 1990 QE9 |
| Epoch May 14, 2008 | |
| Ap | 3.048280130781489 |
| Peri | 2.687120463488083 |
| Eccentricity | .06297026011648663 |
| Orbital period | 1773.777202653891 |
| Mean anomaly | 169.004414895554 |
| Inclination | 1.721763301379498 |
| Longitude of ascending node | 352.7623529416713 |
| Argument of peri | 55.76087021500756 |
| Absolute magnitude (H) | 13.5 |
8657 Cedrus (1990 QE9) is a main-belt asteroid discovered on August 16, 1990 by E. W. Elst at the European Southern Observatory.
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